Improved Clickjacking defense cheat sheet by adding Double clickjacking into it.

[caffeine-rohit]

1️⃣ Remove the ineffective frame-busting scripts and outdated strategies (X-Frame-Options, CSP).
2️⃣ Add the above alternative defenses (Click Delay, Pointer Events, Trusted Interactions, and Mutation Observers).
3️⃣ Clearly explain why traditional protections fail and why these new strategies work better.